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| 有效浓度; 50% 半有效浓度 | |||
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effective concentration : 18 phrases in 8 subjects |
| Agriculture | 4 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Genetics | 1 |
| Space | 1 |
| Technology | 8 |
| Water resources | 1 |
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